Anti-interference PWM high-voltage interlocking signal detection and compensation control method for electric vehicle

Abstract

The invention discloses an anti-interference PWM high-voltage interlocking signal detection and compensation control method for an electric vehicle, and the method comprises the steps: enabling all high-voltage parts to be sequentially connected in series through a low-voltage wire harness to form a closed loop, enabling the high-voltage part of any node to monitor a high-voltage interlocking signal transmitted by a previous node, and outputting the high-voltage interlocking signal with the same frequency to a next node; and when the HVIL signal frequency detected by the high-voltage componentof a certain node is abnormal, immediately reporting the abnormal HVIL signal frequency to the VCU to immediately turns off the high-voltage output of the whole vehicle. According to the invention, the high-voltage interlocking signal is a PWM signal with a fixed frequency duty ratio, the anti-interference capability is strong, and the high-voltage interlocking signal can be effectively detected;according to the invention, the HVIL signal is compensated, signal interference is effectively suppressed, and detection of a lower-level interlocking unit is facilitated; each high-voltage part is directly communicated with the vehicle control unit, and when a fault occurs, related safety actions are executed at the first time, which is safer and more efficient; the position of each high-voltagecomponent in the series closed loop is unique, and the high-voltage fault occurrence position can be accurately positioned.

Description

technical field [0001] The invention relates to the field of high-voltage interlocking of automobiles, in particular to an anti-interference PWM high-voltage interlocking signal detection and compensation control method for electric vehicles. Background technique [0002] With the gradual deterioration of the global climate, the intensification of urban air pollution and the excessive consumption of oil resources, the development of energy-saving and environmentally friendly new energy electric vehicles has become an important direction of technological innovation in the world's automobile industry and an inevitable choice for the sustainable development of the automobile industry. The high-voltage system of electric vehicles is an insulated and closed system. However, in vehicle maintenance and some special environments, if the high-voltage electrical equipment and its high-voltage connectors are not properly connected, high-voltage exposure will result, resulting in safety ...

AI Technical Summary

Problems solved by technology

The interlocking signal of this solution is issued in a level mode, which is susceptible to interference, and the vehicle controller only sends it to the BMS, and other high-voltage components passively perform related actions

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